White list URL

I'm using CheckPoint 790 appliance.I'm trying to block all internal address outgoing to the internet except white list URL that I had made.I set up the blade control regarding to the firewall policy on Strict mode, and now the last rule on Outgoing section on the policy is : Any- Internet - Block.Above it, I made a manual rule says: Any - Internet - My white list URL and accept.

After this, no one can browse inside the organization to the internet to my White list.